Drive arrangement for a reel and a chaff spreader of a combine

Abstract

A drive arrangement for a reel and a chaff spreader of a combine, having a first hydraulic motor for driving the reel and a second hydraulic motor for driving the chaff spreader, wherein the hydraulic motors are connected in series with regard to the flow of hydraulic fluid.

What is claimed is: 
     
       1. A drive arrangement for a reel ( 52 ) and a chaff spreader ( 60 ) of a combine ( 10 ), having a first hydraulic motor ( 56 ) for driving the reel ( 52 ) and a second hydraulic motor ( 62 ,  62 ′) for driving the chaff spreader ( 60 ), wherein the hydraulic motors ( 56 ,  62 ,  62 ′) are connected in series with regard to the flow of hydraulic fluid, wherein each of the hydraulic motors ( 56 ,  62 ,  62 ′) has a corresponding supply line for supplying hydraulic fluid to said each of the hydraulic motors ( 56 ,  62 ,  62 ′), wherein the hydraulic motors ( 56 ,  62 ,  62 ′) have a fixed displacement volume and are driven by a pump ( 66 ) having a fixed delivery volume, and wherein a proportional valve ( 68 ,  70 ) is arranged in the corresponding supply line ( 80 ,  88 ) of each of the hydraulic motors ( 56 ,  62 ,  62 ′) in order to vary the speed of the hydraulic motors ( 56 ,  62 ,  62 ′), and further wherein upstream connections of the proportional valves ( 68 ,  70 ) and downstream connections of the hydraulic motors ( 56 ,  62 ,  62 ′) are in each case bridged by control valves ( 72 ,  74 ) which maintain a defined pressure or defined flow or both a defined pressure and a defined flow in a connecting line ( 84 ) between the first hydraulic motor ( 56 ) and second hydraulic motor ( 62 ,  62 ′). 
     
     
       2. The drive arrangement according to  claim 1 , wherein the control valves ( 72 ,  74 ) are actuated by the pressure at the downstream connections of the associated proportional valves ( 68 ,  70 ). 
     
     
       3. A combine ( 10 ) having a header ( 38 ) comprising a reel ( 52 ), at least one chaff spreader ( 60 ), and a driven arrangement according to  claim 1 .